No, & they never will be.
Invest in a good pair of ordinary stereo headphones & you'll be far better off.
5.1 headphones are a gimmick, nothing more, & they can never replace a proper home theater.
I imagine they probably receive rave reviews from the crowd who believe that heavy bass defines good headphones, so if you're one of those you'll likely enjoy them.
In the end that's all that really matters.
Viper GTS